Toolholder



July 4, w POREAU 2,353,115

TOOL HOLDER Filed Aug. 11, 1942 2 Sheets-Sheet 1 2| woe/WM 44R THl/R WPOREAU July 4, 1944. A. w. PORE AU 2,353,115

TOOL HOLDER Filed Aug. 11, 1942 2 Sheets-Sheet 2 J 3mm ARTHUR WPORE'AU Patented July 4, 1944 UNlTEl) STATES PATENT OFFICE 2,as,115 I Q 1 TOOLHOLDER Arthur W. Poreau, Middletown, R.. I., assignor to McCrosky Tool Corporation, Meadville, 'Pa.,' a corporation-of Pennsylvania I Application August 11, 1942, Serial No.- 454,449 (or. 29-49) 8, Claims.

The present invention relates to improvements in tool holders for lathes or the like, and more particularly to guard mechanism for such holders. I

In th operation of lathes such as those used in metal turning operations; difliculty is often experienced due to the presence of line chips and pieces of metal from certain types of work which often work under the tool holder or turret and interfere with the holder or turret mechanism.

An important object of this invention is the provision of a guard mechanism to prevent metal pieces or other foreign matter working under the tool holding mechanism.

Another object of the invention is the provision of a guard mechanism of this character which will permit free movement and operation of the tooljholdingturret. c I

A further object of the'iinvention isto provide a'device of: this character which is automatic in operation and which may be readily attached to tool holders in use or applied to tool holders during manufacture.

Still another object of the invention is the provision of a device of the above mentioned character which is of simple construction and operation, which is inexpensive tomanufacture and install, and which will not interfere in any way with the normal operation of the tool holder or turret.

Other objects and advantages of the invention will be apparent during the course of the following description.

In the accompanying drawings, which form apart of this specification, and wherein like numerals designate like parts throughout:

I Figure 1- is an elevation-of a tool holding turrethaving my invention applied thereto;

Figure 2 is a top planview thereof;

Figure 3 is a fragmentary elevationshowing the-operative position of the guard mechanism; Figure 4' is a fragmentary perspective; view of the turret during rotation and illustrating the action of the'gu'ard plates during adjustment of the tool turret; o

Figure 5 is an elevationsimilar to Figure l with parts shovvn in section to disclose the operative position of two of the guard plates and illustrating the turret indexing mechanism;

Figure 6 is a bottom plan view of the turret body with the indexing column removed;

Figure 7 isa fragmentary detail view, partly insection;showing one position of one of the guard plates, and, I v

Figure 8 is a similar view showing another position of one of the plates; I I I In the drawingswhereinfor the-"purpose of illustration is shown a preferred embodiment of ,the invention, the-numeral: l0 designatesthe body of a tool-holding turret having an upper horizontal flange II- and a lower horizontal:- flang l2. The flanges H and l-2 extend about the perimeter of the body l0 and suitable boltsl3 extend vertically through the upper flange H to engagethe tools [4-, whichare disposedbeitween the two flanges, to removably secure the; same in position. I w-hile 'only onetool is'illustrated in Figures 1 and 2, a pluralityof such tools are employed, depending uponthe type 'of work: to be done, and upon thetypeof turret used:

A circular bore I5 extends axially'through the; body II] from top to bottom-thereof anda large circularrecess I6 is disposed concentrically about the bore'onthebottom of-body IIJ -Aseries of tooth-shaped notches ll are disposedtabout theperiphery of the recess toformteeth 18. -The notches are shown as twelve in nurnber although any'sultable number may beemployed; A handle I9 is secured to the top of the body H) by meansof a collar 20 which permits relative rotation between the handle and body but prevents move ment of the handle away fromthe body l0. I

The stationary base -2l:of an indexing columnis adapted to fit within'the recess-l6 and hasteeth adapted-to mesh' with the teeth la. The, column extends upwardly through the bore l5, and has its upper-portion: provided with a steep square cut thread 22, thethreadedportion ofthe column extending a substantial distance above I the body l0;- The handlelais provided with a bore alignedwithbore l5- and having an internal thread complementary to thread 22 on the col-.-' umn. The indexingcolumn has an axial bore to receive a bolt 23,- which: extends completely L through the column andcarries a cross member 24 at its lower end adaptedto be slidably;

received inthe horizontal portion of a T-slot 25' extending from end to end throughthe come pound rest 26.. A nut 2]. engages thethreaded upper endoi bolt'23 and whenit is tightened in place, it locks the body and column in position and by binding the cross member in the slot 25 it secures the column in adjusted position on 1 the rest 26. I

A cam 28 -is secured to the top of the column and fits within a notched portion of the handle I9. A springpressed plunger 29 normally engages in a recess 30 in the cam to lock the handlein position. A sleeve 31 surrounds the lower por-- 28, and this rotation of the handle acts through thread 22 to bodily raise the handle and body Ill. The column and base 2| cannot rise with the body, due to bolt 23, and consequently the notches II are raised out of contact with the indexing teeth on base 2|. The body In may then be rotated about the column to the desired position and lowered by a reverse rotation of handle I!) so that notches l1 again receive the teeth on base 2|, to lock the body in its adjusted position. The body and tool are then in position for the desired operation.

The turret mechanism thus far described is of well-known construction, being of the McCrosky type, and need not be further described here. The turret construction shown and described is for convenience of illustration, and it is not intended that the guard mechanism of this invention be restricted to use on this particular turret, index mechanism or rest 26 as it may obviously be used on other kinds of turrets or tool holders.

In the operation of tool holders or turrets of the general type illustrated, it has been found in practice that in certain types of work the cuttings or chips will be sufilciently fine to work in between the bottom of the body In and the top of the rest 26 and interfere with the'accurate functioning of the indexing notches and teeth. This is highly objectionable because the tools must be held in the proper position to insure accurate work. It is the purpose of this invention to prevent 'passage of chips or other foreign material between the tool holder and the rest 26.

As indicated in Figures 1, 2 and 5, the turret body with flanges included is square and has a width corresponding to the width of the rest 26 which'is shown as being longer than the turret body. Each side of the body flange I2 is provided with a guard plate 33 of the same length as the body flange and of substantially greater height. Each plate 33 is provided adjacent each endwith an elongated vertical slot 34. A bolt 35 extends through each slot in a horizontal direction and is embedded in or otherwise secured to the outer face of the body flange l2. as by means of screw threads as indicated in Figures 7 and 8. The bolts 35 may have removable nuts 36 for heads, as indicated in the drawings. or may have integral heads. The bolts '35, or the nuts 36 are so adjusted that the plates 33 are free to move vertically. The slots 34 limit the vertical movement of the plates. In the lower position of the plates, they extend a substantial distance below the bottom of the body l and below the upper edge of the rest 26 as indicated in Figures 1, 3, and 7. In their upper position the plates are disposed above the top of the. rest 26, as indicated particularly in Figures 4 and 8.

An important feature of the plates is that their lower corners are rounded to provide cam surfaces 31 at each lower end of each plate. The

" rest 26.

longitudinal edges of the rest 26 are also rounded at 38, as is customary.

In the normal operating position of the turret, two opposite plates 33 will be in their lower positions indicated in Figure 7 and will extend down along the side of the rest 26, efiectively covering the slight space 39 between the bottom of the body I0 and the top of rest 26. This space 39 is exaggerated in the drawings, for the purpose of illustration. The other two plates 33 will be in a raised position, indicated in Figure 8 with their bottoms resting upon the top of the The weight of the plates will insure a close engagement of the plate with the top of the rest and prevent passage of any foreign material.

When the turret body is rotated to bring another tool into position, or for any other purpose, the rounded cam surfaces of the plates in the lower position will engage the rounded top edge of the rest and raise'the plates to permit their passage across the top of the rest 26. The raised position of the plates during rotation of the turret is indicated in Figure 4. Due to the cam surfaces 31 and 38, the plates will be automatically raised and will not require manual control.

It will be seen that the plates 33 may be readily attached to tool holders or turrets and will efiectively prevent passage of cuttings, chips or other foreign matter. The guard plates may be used with various types of tool holders and with other types of rests, and when applied to a tool holder they do not require any attention by the operator.

Having thus described my invention, what is claimed is:

1. In a device of the character described, a rest, a tool holder adjustably mounted on the top of the rest, and 'a guard plate movably carried by the tool holder and adapted to extend below the top of the rest in one position and to be disposed above the top of the rest in another position, and said rest and said guard plate having means which cooperate upon adjustment of the tool holder on the rest to raise the guard plate from its lower position to its higher position above the rest.

2. In a device of the character described, a

rest, a tool holder rotatably mounted on the top of the rest, a guard plate disposed along one side wall of the holder in a substantially vertical position, and means connecting the tool holder and guard plate and permitting sliding movement of the guard plate vertically from a position in which the plate extends below the rest to a position in which the plate is disposed entirely above the rest, said connecting means comprising a bolt and a cooperating vertically elongated slot, and said rest having means which upon rotation of the tool holder on the rest engages and raises the guard plate from its lower position to a position above the rest.

3. In a device of the character described, a

'rest, a tool holder rotatably mounted on the top of the rest, a guard plate disposed along one side wall of the holder in a substantially vertical position, and means connecting the tool.

holder and guard plate and permitting sliding movement of the guard plate vertically from a position in which the plate extends below the rest to a position in which the plate is disposed entirely above the rest; said guard plate being freely movable from its lower position to its higher position, and said rest having cam means which upon rotation of the tool holder on the rest engages and raises the guard plate from its lower position to a position above the rest.

4. In a device of the character described, a

rest having a rounded upper edge, a. rectangular tool holder rotatably mounted on the top of the rest, and a guard plate disposed along the lower portion of each side of the holder in a substantially vertical position, each guard plate being connected to the tool holder by a sliding connection permitting movement of said plate vertically from a position in which the plate extends below the rest to a position in which the plate is disposed entirely above the rest, said guard plates being freely movable from their lower positions to their higher positions, the lower corner of each plate being shaped to form a cam surface for engaging the rounded upper edge of the rest to raise the plate from its lower position to a position above the rest when the tool holder is rotated with respect to the rest.

5. The combination with a tool holder adjustably mounted on a rest having a rounded upper edge, of a guard late carried by the tool holder adjacent one edge thereof, said plate having one position in which it extends below the top of the rest and another position at which it is disposed above the top of the rest, and said plate having a cam surface to engage the rounded upper edge of the" rest for raising the plate when the tool holder is adjusted with respect to the rest.

6. In a device of the character described, a rest, an indexing column secured to said rest and having a corrugated indexing base supported on said rest, a rectangular tool holding turret rotatably mounted on said column and having its lower portion provided with corrugations to engage and mesh with the corrugations of the indexing base, means to move said turret out of operative engagement with the indexing base, and guard plates carried by the lower portions of the sides of the turret, said'plates being independently movable vertically from a position in which they extend below the top of the rest to a position in which they are disposed above the to of the rest, said plates being connected to the turret by means of bolts and cooperating vertically elongated slots, and said rest having means which upon rotation of the turret on the column engages and raises the guard plates from their lower position to their position above the rest.

7. 'In a device of the character described, a rest, an indexing column secured to said rest and having a corrugated indexing base supported on said rest, a rectangular tool holding turret rotatably mounted on said column and having its lower portion provided with corrugations to engage and mesh with the corrugations of the indexing base, means to move said turret out of operative engagement with the indexing base, and guard plates carried by the lower portions of the sides of the turret, said plates being independently movable vertically from a position in which they extend below the top of the rest to a position in which they are disposed above the top of the rest, said guard plates being freely movable from their lower to their higher positions, and said rest having cam means which upon rotation of the turret on the column engages and raises the guard plates from their lower positions to their higher positions above the rest.

8. In a device of the character described, a rest having a rounded upper edge, an indexing column secured to said rest and having a corrugated indexing base supported on said -rest, a. rectangular tool holding turret rotatably mounted on said column and having its lower portion provided with corrugations to engage and mesh with the corrugations of the indexing base, means to move said turret out of operative engagement with the indexing base, and guard plates carried by the lower portions of the sides of the turret, said plates being independently movable vertically from a position in which they extend below the top of the rest to a position in which they are disposed above the top of the rest, said plates being connected to the turret by means of bolts and cooperating vertically elongated slots, the lower corners of each plate being shaped to form a cam surface for-engaggaging the rounded upper edge of the rest to raise the plate from its lower position to a position above the rest when the turret is rotated about the column.

ARTHUR W. POREAU. 

